coles



(No Model.) s Sheets-Sheet 1, D. H. OOLES. SEWING MACHINE.

No. 421,816. Pented Feb. 18, 1890.

WITNESSES: INVENTOH.

(No Model.) I Q 3 Sheets-Sheet 3.

D. H. COLES.

v SEWING MACHINE, I No. 421,816. Patented Feb. 18, 1890.

ATTORNEYS v M PEXERS. PholoLilmgnpMr. Washington. 0. c.

UNITE STATES PATENT OF IcE.

DAVID H. COLES, OF BROOKLYN, ASSIGNOR TO THE MANHATTAN QUILT- ING AND MANUFACTURING COMPANY, OF NEW YORK, N.'Y.

SEWING-MACHINE.

SPECIFICATION formingpart of Letters Patent No. 421,816, dated February 18, 1890.

Application filed July 13, 1889- To all whom it may concern.-

Be it known that I, DAVID H. COLES, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Sewing-Machines, of which the following is a specification.

This invention relates to certain improvements'in that class of sewing-machines which I have described in Letters Patent No. 340,863, granted to me April 27, 1886, and in which the material to be sewed is carried bodily round beneath the needle, so as to produce a line of stitches forming a closed figure, and after such closed figure has been completed the material is moved to bring a fresh portion beneath the needle for the formation of another closed figure.

The peculiar and novel devices and combinations of parts which form the subjectmatter of my present invention are pointed out in the following specification and claims and illustrated in the accompanying drawings, in which Figure 1 represents a side elevation, looking in the direction of arrow 1, Fig. 2. Fig. 2 is a front elevation, looking in the direction of arrow 2, Fig. 1. Fig. 3 is a horizontal section in the plane as m, Fig. 2. Fig. 4. is a partial horizontal section in the plane 3 y, Fig. 1, on a larger scale than the previous figures. Fig. 5 is a vertical section inthe plane 00' at, Fig. 4:. Fig. 6 is a horizontal section in the plane y y, Fig. 5. Fig. 7 is a horizontal section in the plane a 2', Fig. 1. Figs. 8 and 9 are details which will be referred to as the description progresses. Fig. 10 is a horizontal section in the plane .2 .2, Figs. 1 and 2. Fig. 11 is a section, and Fig. 12 a plan view of the tension on a larger scale than Figs. 1, 2, and 3.

Similar letters indicate corresponding parts.

In the drawings, the letter A designates the main frame, from which rise the standards B B,'to which are secured the bars 0 O, and to these bars are secured brackets 0 0, which are of diiferent height and form the guides for the needle-slides D D These needle-slides are arranged in two rows, one in front of the other, as indicated in Figs. 1 and 10, and they are connected in pairs by Serial No. 317,410. (No model.)

straps a, each of which is firmly secured to one of the needle-slides D of the front row, and to one of the needle-slides D of the rear row and connected to a lever 19, the connection being made by a pivotal link 0*. The various levers b are mounted on a rock-shaft cl, to which motion is imparted by means of an eccentric e, which is mounted on a shaft E in the lower part of the main frame A. This eccentric connects with a bell-crank 1ever F, Figs. 1 and 3, which is connected by a rod f with the tail of one of the levers b, so

as to impart a rocking motion to the rockshaft d and a reciprocating motion to all the needle-slides. From the description it will be seen'that each of the levers 1) controls the connected inpairs by links 9*, Figs. 1 and 2. A rocking motion is imparted to one of the rock-shafts I, Fig. 3, by means of an eccentric g, mounted on ashaft I-I.

J is the work plate or table, which is firmly I secured between the standards B B, and K is I the presser-plate, to which a rising and falling motion is imparted by means of cams h h. Theseeccentrics are mounted on the shaft L, and they act on levers ZZ, Figs. 2 and 3, which swing on studs Z secured in the side of the main frame A, and from the free ends of these levers extend rods m m, which connect with the slide M, to which is secured the presserplate K. The slide M is guided 'in slots m Fig. 1, in the standards B, Fig. 1, and as the cams h turn the presser-plate K is raised, and then permitted to sink down so that it bears upon the material to be sewed by its own gravity. On the shaft L, outside of the cams h, are also mounted cams n n, which act on leverso 0, Figs. 1, 2, and 3, which swing on the same studs 1* on which also swing the levers Z Z. From the free ends of the levers 0 0 extend rods 19 p, which connect with levers q q,

mounted on the ends of a rock-shaft N. This rock-shaft has its hearings in the upper ends of the standards B 15, which are connected by a traverse O, on which are mounted the tensions P, one for the thread of each needle. These tensions consist of friction-plates 19 each of which is depressed upon the traverse O by a spring pfi'wound round the shank of an adj ustin g-screw p in a manner well kn own to those skilled in the art. The thread for each needle passes beneath one of the friction-plates p and is pressed down upon the traverse 0 so as to produce the required tension. (See Figs. 11 and 12.) On the shaft N are mounted toes g, which serve to raise the friction-plates 19 so as to release the threads from all tension at the moment the material to be sewed is being moved from one line of sewing to another.

Q is a circularlyanovable cloth-supportin g carriage, in which are mounted two pairs of rollers R R" S S", each pair being geared together and being subjected to the action of a spring, so that they press upon the material which passes through between them. The material to be sewed is passed through be tween the rollers R R", thence over the worktable J and over the roller S, then through between the rollers S S and out beneath the roller S as indicated in Fig. 1, a guideroller T being provided to keep the material down upon the work-table. The roller S" is mounted loosely on its shaft, and retained thereon by a pawl s and ratchetavhecl s", so that it can be turned in one direction in order to keep the material taut in its passage over the worktable. The cloth-supporting carriage Q rests loosely upon the main frame A, and in order to be able to turn the same round in a circle with the least possible friction I place between the main frame A and the carriage double-pointed pins it, which rest in cavities i" t in the upper surface of the main frame and in the lower surface of the cloth-supporting carriage, Fig. 1. The rotating move ment of the roller carriage Q is produced by two vertical arbors T T, Figs. 1 and 3, which rise from disks u it and pass through holes in the side bars of the cloth-supporting carriage, as seen in Fig. 1. The disks a are secured eccentrically to disks 1, which are mounted on vertical arbors U, Figs. 1, 2, and 5, and in order to be able to increase or decrease the eccentricity of the arbors T the bolts which serve to secure the disks u to the disks 0) pass through slots in the disks a. (See Figs. 4 and 5.) The arbors U have their bearings in brackets secured to the sides of the main frame A, Fig. 2, and they are geared together with a horizontal arbor V, to which a rotating motion is imparted from a shaft X through intermediate shafts Y Z, Fig. 1. On the shaft X is mounted a cam 03 which gears into a cog-wheel 1 mounted on the shaft Y, so that for each revolution of the shaft X the shaft Y is turned for the space of one tooth of the cog-wheel 1 the cam it being so formed the shaft Z is, gradually decreased.

that this movement is accomplished during about one-third of the revolution of the shaft X, leaving the shaft Y at rest during the remaining two-thirds of. the revolution of the shaft X. If this cog-wheel 3 has sixteen teeth, the shaft Y makes one revolution for each sixteen revolutions of the shaft X. The motion of the'shaft Y is transmitted to the shaft Z by gear-wheels a Z), which are eccelr tric or elliptical, Fig. 8, so that the shaft Z makes the. same number of revolutions as the shaft Y, but its motion is irregular, being slowest when the wheels a b are in the position shown in Fig. 8, when it is gradually increased until the shafts Y Z have completed one-half a revolution, and then the motion of shaft Z is mounted a bevel-wheel c, which gears into a pinion d, mounted on the shaft YV, and this shaft is geared together with the vertical arbors U by bevel-wheels e e of equal diameters. The diameter of the pinion (Z is onehalf of the diameter of the beveh wheel 0, so that the shafts V U make two revolutions to each revolution of the shaft Z and to each sixteen revolutions of the shaft X. The shafts X, E, and H are geared together, so that they revolve with the same velocities, and by each revolution of the shafts E and H the needles and shuttles are moved so "as to produce a stitch. By each revolution of the arbors U T the cloth-supporting carriage Q is caused to move horizontallyin a circle or circular path, and during this motion two series of circular scams 8 s, Fig. 9, are produced, each of said seams being formed of eight stitches of gradually-increasing length, as will be readily understood from the position of the wheels ctb, Fig. 8. On the sec- 0nd revolution of the arbors U T a second series of stitches is thrown into the circularscams s S, the length of these stitches being gradually decreasing, which change is produced by the eccentric-wheels a b, as above stated, so that the first series of eightstitches is strength ened by the second series of eight stitches. After the firstseries of circular scams 3 s, Fig. 9, has been completed, it is necessary to move the material to be sewed forward, so as to bring the sewing-lines for the second series of circular scams .9 8 under the needles. This feed-motion is produced by the following means: 011 each of the vertical arbors T is mounted a pinion f, which gears into a cog-wheel g, mounted 011 a stud 71,, Figs. 1 and 2, which is firmly secured in the roller carriage Q. To each of the cogwheels g is firmly secured a cam t", Figs. 1, .3, and 7, which acts upon a leverj. This lever has its fulcrum 011 a pivot and it carries a pawl Z, which engages a ratchet-wheel m, firmly connected to the roller S. The cogwheel 9 has twice as many teeth as the pinion f, so that for each two revolutions of the vertical arbor T the cog-wheelg',togetl1cr with the cam 2', makes one revolution. As the cam 1; turns in the direction of the ar- On the rows shown near the same in Figs. 3 and 7, the lever j is forced back in the direction of arrow 4, Fig. 1, and the pawl Z is moved to engage a fresh tooth of the ratchet-wheel m, and as soon as the point of the cam 2" releases the leverj the latter is caused to return to its normal position (shown in Fig. 1)

by the action of a spring n, and the roller S is caused to turn for the space of one tooth of the ratchet-wheel m. This motion takes place instantaneously during the time the needles are raised and the arbors T are stationary. At the same instant the tensions P are released and the material to be sewed is moved so as to bring the sewing-lines forthe a sewing-machine with a single row of needles, or, in fact, to a sewing-machine with a single needle. I

What I claim as new, and desire to secure by Letters Patent,'is-

1. In a sewing-machine, the combination, with the stitch-forming devices and with the main frame A, of the cloth-supporting carriage Q, the cavities t t in the main frame and in thecarriage, the pointed supports t, placed in said cavities, and means for imparting to the carriage a circular motion, substantially as described.

2. In a sewing-machine, the combination of two rows of needle-slides, one in front of the other, a series of straps, each of which is made to connect one of the needle-slides of the front row with one of the needle-slides of the rear row, and actuating-levers connected to these straps, substantially as described.

3. In a sewing-machine, the combination, with the stitch-forming devices, of the carriage Q, the eccentrically-connected arbors engaging said carriage, and mechanism for imparting to the arbors step by step two complete revolutions, said mechanism comprising the eccentric=wheels a b,'for varying the steps of the motion imparted to the arbors, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

DAVID H. COLES. 

